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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
 9 Months Ended
Sep. 30, 2021
USD ($)
shares
Atlas General Holdings LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid $ 95,200,000
Escrow Deposited 5,400,000
Recorded Earnout Payable 8,700,000
Total Recorded Purchase Price 109,300,000
Maximum Potential Earnout Payable 35,000,000.0
Bollington Wilson Group [Member]  
Business Acquisition [Line Items]  
Cash Paid 328,000,000.0
Escrow Deposited 1,400,000
Total Recorded Purchase Price 329,400,000
LDJ American Online Benefits Group, LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 38,200,000
Escrow Deposited 7,100,000
Recorded Earnout Payable 14,800,000
Total Recorded Purchase Price 60,100,000
Maximum Potential Earnout Payable $ 20,000,000.0
Sixteen Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 337,000.0
Common Share Value $ 44,400,000
Cash Paid 157,300,000
Accrued Liability 13,100,000
Escrow Deposited 18,900,000
Recorded Earnout Payable 34,100,000
Total Recorded Purchase Price 267,800,000
Maximum Potential Earnout Payable $ 70,200,000
2021 Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 337,000.0
Common Share Value $ 44,400,000
Cash Paid 618,700,000
Accrued Liability 13,100,000
Escrow Deposited 32,800,000
Recorded Earnout Payable 57,600,000
Total Recorded Purchase Price 766,600,000
Maximum Potential Earnout Payable $ 125,200,000